The Vixen 25091 consists of the ED103S, a 4” f/7.7 refractor with Super ED glass, and the SXP GoTo equatorial mount with a Star Book Ten controller. This is a great intermediate to advanced level equatorial telescope package with dual-axis drive, computerized GoTo electronics, and a Japanese-made, high quality refractor.
About the ED103S Refractor Telescope
The high definition ED lens in Vixen's ED103S Refractor Telescope gives excellent optical performance in a short optical tube for easy handling. The extra-low dispersion ED lenses feature bright images from the f/7.7 focal ratio telescope and capture crisp, pinpoint star images for your eye's enjoyment. Vixen's ED glass produces clear and high contrast viewing, virtually free of false color. The design uses environmentally friendly glass technology, free of hazardous lead that helps to support a cleaner global environment. Vixen's proprietary lenses focus the full visible spectrum of visible light to a critical point. The astro-photographer will be especially pleased with the high contrast images through this telescope. The ED103S Refractor comes complete with 90mm tube rings, 7x50 finder Scope, flip mirror, and dovetail plate.
About the Vixen SXP Mount
Designed for the astrophotographer, the Vixen Sphinx SXP Equatorial Mount builds on leading edge innovations developed through decades of experience designing German Equatorial Mounts. The Vixen SPHINX SXP mount and STAR BOOK TEN hand controller display the best in portable GoTo technology. The Sphinx SXP Mount comes standard with the STAR BOOK TEN. This new generation of hand held controllers features a high definition LCD screen and the technology to show you the sky before your telescope takes you there. The Vixen SXP Mount has a maximum loading weight of 35 lb. for astrophotography and 50 lb. for the visual observer.
Vixen Sphinx SXP Mount Features
Motors: The Sphinx SXP Mount features pulse motors designed to react smoothly and accurately. The micro slow motion control assures you of smooth operation.
R.A and DEC: The R.A. and DEC wheels have 180 teeth. They are high precision machined wheels and worm gears made of brass for the most accurate tracking possible. The R.A. and DEC shafts are comprised of strong carbon steel. The rotational parts have 15 bearings. All this provides smooth tracking and slewing.
Unique Mount Design: The Vixen Sphinx SXP Mount is designed so that the mount body acts as part of the counterweight system.
Periodic Error Correction: Data from your input is saved for your next observing session.
Polar Axis Scope: The Sphinx SXP Mount includes a built-in 6x20 polar axis scope. It features a bubble level, illuminated reticle, and setting accuracy within 3 minutes.
- Time Graduation Circle: 10 Minute Increments
- Date Graduation Circle: 2 Day Increments
- Meridian Offset Circle: Adjustable between E20 deg and W20 deg in 5 deg increments
- Northern Hemisphere: Polaris pattern with reticle (Applicable to year 2025)
- Southern Hemisphere: Octantal 4 stars pattern with reticle
STAR BOOK TEN & HAL-130 Tripod Features
The STAR BOOK TEN is the most advanced astronomical hand controller available and is recommended for anyone interested in exploring the night sky. The innovative STAR BOOK TEN hand controller offers astronomical navigation with a large full-color High Definition LCD screen! The color screen is a detailed star chart that acts as a navigational and GOTO guide for the mount.
The screen can be displayed with monochromatic red light in order to maximize the accommodation of your eyes to darkness. The operating keys can also be lit in red.
Hibernate Mode: After selecting to continue the current setup at the initial screen, you can break and restart your automatic slewing and tracking of the mount by just flipping the power switch, if the mount is still in place, without loosening the R.A. and DEC clamp levers.
Different Tracking Rates: The motion of the moon, the sun, planets and comets have different tracking rates than the stars. The STARBOOK TEN moves the mount at different rates, automatically, dependent upon the target object.
Artificial Satellite Watching: The STARBOOK TEN has a menu to find and track artificial satellites by entering the orbital elements of the satellites. the ISS and named satellites are pre-registered.
The HAL130 Tripod provides ample stability and has no wobble points in its design. The HAL130 has a large base to carry the Sphinx SXP mount. The tripod extends from 32" to 51" (81cm to 130cm) and weighs 12 lb.(5.5 kg).
- Vixen ED103S ED APO Refractor
- Flip Mirror Diagonal
- Finder Scope & Bracket
- Tube Rings
- Vixen-style Dovetail
- Vixen Sphinx SXP Equatorial Mount
- Dual-Axis Pulse Motors
- Built-in 6x20 Illuminated Polar Scope
- STARBOOK TEN hand controller
- Starbook Ten cable and strap
- One 4.2 lb. Counterweight
- One 8 lb. Counterweight
- Cigarette Plug Cord
- HAL130 Tripod
Dimensions & Specifications
ED APO Refractor
1.13 arc seconds
Light Gathering Power:
Via STARBOOK TEN
35 lb. & counterweights
RA and DEC Slow Motion:
Worm and Wheel Gears
Wheels Number of Teeth:
RA Slow Motion Axis:
72mm diameter, brass
DEC Slow Motion Axis:
72mm diameter, brass
40mm diameter, carbon steel
40mm diameter, carbon steel
0° ~ 70 degrees latitude
2° per rotation
Number of Bearings:
4.2 lb. and 8 lb.
Pulse with 300pps
12V DC, DC Adapter Included
13.5 x 14 x 5 inches
24.25 pounds without counterweights
5” TFT Color LCD WVGA
6 pole, 6 wired modular jack for external unit
Controller to Mount Connector Port:
D-SUB 9 pin male plug
6.6 x 6 x 1.18 inches
HAL130, adjustable from 32 to 51 inches
We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.
Default manufacturer warranty.
Return & Exchange Policy
At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.